The issue is mono and nginx together. Here is all I can give you from an old template when clonedeploy was called cruciblewds. I used for installing on open media vault with nginx. The 2 files you download will need updated.wget "http://docs.cruciblewds.org/omv/cwds"
wget "http://docs.cruciblewds.org/omv/cwds.conf"
cp cwds.conf /etc/nginx/openmediavault-webgui.d/
cp cwds /etc/init.d/
chmod +x /etc/init.d/cwds
echo "fastcgi_param PATH_INFO \"\";" >> /etc/nginx/fastcgi_params
echo "fastcgi_param SCRIPT_FILENAME \$document_root\$fastcgi_script_name;" >> /etc/nginx/fastcgi_params
service nginx restart
service cwds start
update-rc.d cwds defaults